How long after driving on the highway can you wash the car?
2 Answers
You can wash the car 15 to 20 minutes after driving on the highway, once the engine and other systems have cooled down. After high-speed driving, both the brakes and the engine are in the cooling phase. Washing the car immediately could lead to minor issues like brake disc deformation or, in severe cases, brake system failure, compromising driving safety. During high-speed driving, the vehicle undergoes intense friction with the air, raising its temperature. Using cold water to wash the car's surface at this point might cause the paint to crack. Precautions for car washing: 1. Do not wash the car before the engine has completely cooled down, as this can lead to premature engine aging; 2. Avoid washing the car under direct sunlight, as it can leave dried water spot marks on the body; 3. Refrain from washing the car in very cold weather, as water freezing can cause the paint film to crack; 4. Do not use water other than soft water for washing, as it can damage the paint.
Right after I got home from a highway drive, the car was covered in bug splatters and dust, which was really annoying. But I never rush to wash the car—why? The brake discs and engine get extremely hot during highway driving, with temperatures easily exceeding 100°C. Spraying cold water directly on them can cause thermal shock, leading to warping or even cracking. Repairing brake discs can cost anywhere from a few hundred to over a thousand bucks, and a cracked engine is even worse. I recommend waiting at least 30 minutes to an hour to let the car cool down naturally. Just touch the hood—if it doesn’t feel hot, you’re good to go. In winter, you might need to wait longer. When washing, I start with the wheels and use lukewarm running water, avoiding the high-temperature components. Highway driving puts extra wear on the brakes, so regular checks can extend their lifespan—don’t risk major damage over minor savings.
